"It's clear why it's become
our tool of choice."
WHAT IS UHP?
THE SCIENCE OF ULTRA-HIGH PRESSURE:
SMALLER DROPLETS. BIGGER IMPACT.
THE PHYSICS OF ULTRA-HIGH PRESSURE
Ultra-High Pressure (UHP) is defined by the National Fire Protection Agency (NFPA) as pump pressures above 1100 psi. By flowing water at these pressures, water droplets are broken into 64 smaller droplets, creating 10 times the surface area.
Greater surface area means more contact with the fire and more efficient heat absorption. When the water droplet absorbs heat, it converts to steam, displacing oxygen, and removing heat from the super-heated environment -- and extinguishing the fire.
The result? When using UHP, you'll only use a fifth of the water to extinguish the fire compared to a conventional low-pressure, high-volume attack.
THE CLEAR WINNER.
HMA’s Hydrus® UHP handline system demonstrated the fastest extinguishment time while using the least suppressant agent.
By optimizing our Hydrus® system flowing 20 GPM at 1450 psi, HMA provides higher efficiency and safer firefighting versus a conventional system.
JET FUEL FIRE TESTING
HMA Fire, in conjunction with the US Air Force Fire Research Lab (AFRL) at Florida's Tyndall Air Force Base, tested various flows at conventional (normal) pressure (125 psi) and ultra-high pressure (see chart to the left) in a 3,500 square-foot pit containing 380 gallons of JP-8 military jet fuel.
- UHP consistently and fully extinguished more fire.
UHP consistently used 1/5 the volume water compared to a low-pressure line.
At 20 GPM, 1450 psi, UHP beat the best low-pressure time by 46 percent and used 86 percent less water.
UHP extinguishes the fire faster and more efficiently, reducing firefighter fatigue, exposure to IDLH environments, and drastically reducing damage from water.
THE HEAT DROPS HARD AND FAST.
Smaller water droplets, greater surface area and rapid steam conversion help UHP
extinguish fire and reduce room temperatures in significantly less time. Fires are put out faster and firefighters operate in safer conditions.
- Looking at the chart on the right, taken from structure fire tests, at 40 seconds into the fire, HMA’s Hydrus® system had lowered the ceiling temperature to 500ºF cooler than the low pressure system.
UHP extinguished a 16’ x 24’ room at flashover in 17.3 seconds using only 11.6 gallons of water + foam (data not shown).